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Rust-Proof Impact-Resistant Vibration-Proof Noise-Reduced Track Crawler Guide Rail for DC105 Factory Direct. Made of high-quality alloy steel; features a hard exterior and a tough, resilient core; highly wear-resistant and impact-resistant. OEM-Spec Precision Machining for DC105: Direct Fit, Anti-Derailment. Smooth Low-Friction Surface: Rubber-Track Friendly & Corrosion Resistant.